Sulfide solid electrolyte, preparation method thereof and all-solid-state battery

A solid electrolyte and sulfide technology, applied in the field of electrolytes, can solve problems such as low ion conductivity and no experimental reports, and achieve the effects of simple operation, improved ion conductivity, and safe and efficient preparation process

Active Publication Date: 2021-07-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thirty years ago, all-solid-state lithium-ion batteries lost out to organic-electrolyte lithium-ion batteries due to the relatively low ionic conductivity of solid-state electrolytes
Combining lithium borohydride with the classical lithium-argentine-type sulfide solid-state electrolyte would theoretically greatly improve the performance of the electrolyte, however, there are no experimental reports on the synthesis

Method used

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  • Sulfide solid electrolyte, preparation method thereof and all-solid-state battery
  • Sulfide solid electrolyte, preparation method thereof and all-solid-state battery
  • Sulfide solid electrolyte, preparation method thereof and all-solid-state battery

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preparation example Construction

[0028] Based on the same inventive concept, the present application also provides a method for preparing the above-mentioned sulfide solid state electrolyte, comprising the following steps:

[0029] S1. Put Li 2 S, LiCl, LiBH 4 , P 2 S 5 Mix evenly to obtain a mixture;

[0030] S2, the mixture is placed in a ball-milling jar for ball-milling;

[0031] S3, compressing the ball-milled mixture into a tablet and sintering to obtain a sulfide solid electrolyte.

[0032] It should be noted that all the above operation steps are carried out under the argon atmosphere, that is, the mixing, ball milling, tablet pressing and sintering treatments are all carried out under the argon protection. The preparation method of the sulfide solid state electrolyte of the present invention adopts the preparation method combining mechanical ball milling and high-temperature sintering, which is simple in operation and safe and efficient in the preparation process.

[0033] In some embodiments, ...

Embodiment 1

[0043] The embodiments of the present application provide a sulfide solid state electrolyte, the chemical formula of which is Li 6 PS 5 Cl 0.9 (BH 4 ) 0.1 .

[0044] Specifically, the preparation method of the above-mentioned sulfide solid state electrolyte comprises the following steps:

[0045] S1. Weigh Li with a molar ratio of 25:9:1:5 2 S, LiCl, LiBH 4 , P 2 S 5 , and mixed uniformly under an argon atmosphere to obtain a mixture;

[0046] S2. The mixture is ground with an agate mortar for 10 min under an argon atmosphere, and then placed in a ball-milling jar for ball-milling under an argon atmosphere; the ball-milling conditions are: using zirconia balls as the ball-milling medium, and the mass ratio of the mixture to the zirconia balls It is 1:32, the speed of ball milling is 550rpm, and the ball milling time is 15h;

[0047] S3. The ball-milled mixture is ground in an agate mortar for 15 minutes under an argon atmosphere, and then placed in a tablet press und...

Embodiment 2

[0049] The embodiments of the present application provide a sulfide solid state electrolyte, the chemical formula of which is Li 6 PS 5 Cl 0.5 (BH 4 ) 0.5 .

[0050] Specifically, the preparation method of the above-mentioned sulfide solid state electrolyte comprises the following steps:

[0051] S1. Weigh Li in a molar ratio of 5:1:1:1 2 S, LiCl, LiBH 4 , P 2 S 5 , and mixed uniformly under an argon atmosphere to obtain a mixture;

[0052] S2. The mixture is ground with an agate mortar for 10 min under an argon atmosphere, and then placed in a ball-milling jar for ball-milling under an argon atmosphere; the ball-milling conditions are: using zirconia balls as the ball-milling medium, and the mass ratio of the mixture to the zirconia balls It is 1:34, the speed of ball milling is 600rpm, and the ball milling time is 20h;

[0053] S3. The ball-milled mixture is ground in an agate mortar for 15 minutes under an argon atmosphere, and then placed in a tablet press under ...

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Abstract

The invention provides a sulfide solid electrolyte, a preparation method thereof and an all-solid-state battery. The chemical formula of the solid electrolyte is Li6PS5Cl1-x (BH4)x, and the preparation method comprises the following steps: uniformly mixing Li2S, LiCl, LiBH4 and P2S5 in proportion to obtain a mixture; placing the mixture in a ball milling tank for ball milling; and tabletting the ball-milled sample, and sintering to obtain the sulfide solid electrolyte. According to the sulfide solid electrolyte disclosed by the invention, a BH4 <-> anion group is introduced into the solid electrolyte to replace a part of Cl <-> sites, so that a larger transmission channel is provided; and the conduction of Li < + > is promoted by the unique rotary motion of the BH4 <-> anion group, and after the BH4 <-> anion group is introduced, the ionic conductivity of the electrolyte is greatly improved on the basis of a lithium-argyrodite electrolyte Li6PS5Cl.

Description

technical field [0001] The invention relates to the technical field of electrolytes, in particular to a sulfide solid-state electrolyte, a preparation method thereof, and an all-solid-state battery. Background technique [0002] Safety is a key requirement for large-scale energy storage in electric vehicles, aircraft, and next-generation portable electronics. Compared with currently available liquid electrolyte Li-ion batteries, all-solid-state Li-ion batteries are considered to be the most advantageous next-generation electrochemical energy storage devices due to their high safety, high energy density, simple packaging, and wide operating temperature range. Thirty years ago, all-solid-state Li-ion batteries lost out in competition with organic-electrolyte Li-ion batteries due to the relatively low ionic conductivity of solid-state electrolytes. In recent years, significant progress has been made in improving the ionic conductivity of solid-state electrolytes. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/19C01B35/14H01M10/0525H01M10/0562
CPCC01B6/19C01B35/14H01M10/0525H01M10/0562C01P2006/40Y02E60/10
Inventor 王恒赵宏滨唐亚叶代新方建慧容忠言张久俊
Owner SHANGHAI UNIV
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